Question

Find the mean of the first ten prime numbers.

Answer 1

$$\begin{gathered} \mathrm{As},\mathrm{the}\mathrm{first}\mathrm{ten}\mathrm{prime}\mathrm{numbers}\mathrm{are}:2,3,5,7,11,13,17,19,23\mathrm{and}29. \\ \mathrm{So},\mathrm{the}\mathrm{mean}=\frac{\mathrm{Sum}\mathrm{of}\mathrm{observations}}{\mathrm{Total}\mathrm{number}\mathrm{of}\mathrm{observations}} \\ =\frac{2+3+5+7+11+13+17+19+23+29}{10} \\ =\frac{129}{10} \\ =12.9 \end{gathered}$$

Hence, the mean of the first ten prime numbers is 12.9.